I would like to thank to all guys who tried to help me with the tickets to West Coast. Because I really needed to be as close to PDX as possible ( at the start and at the end of my trip) and because I will carry at least 3 full checked bags, I have chosen the most comfortable way.
At the end I bought a nice PE tickets straight from VIE to PDX for 980EUR, which is pretty good deal I guess. On the way back its in A380, which is a nice bonus I believe.
Thanks for all your input and wish you a pleasant ongoing journeys!